Piston actuated valve for fluid motors



Nov. l0, 1953 T. F. DREYER PISTON AOTUATEO VALVE FOR FLUID MOTORS 2 Sheets-Sheet l Filed April 6, 1948 Theodore Dreyer INVENTOR.

T. F. DREYER PISTON ACTUATED VALVE FOR FLUID MOTORS 2 sheets-sheet 2 Ngv. 1o, 195s Filed April e, 1948 Theodore f'. Dreyer INVENTOR.

9 BY @wm ratenfed Nov. 1o, 1953 UNITED ,2.65,8,485 PIs'roN ACTUATED vALvEFoIt. FLUID MOTORS .Theodore F. Dreyer, Newark, N. J. VApplication April 6, 1948, Serial No. 19,207

This .invention appertans .t novel and useful improvements in devices for lifting charges'of relatively viscous material Hand discharging the same.

An object of this invention istolift and sepa.- rate a charge of material from a supply by an improved pump which includes means for directing a supply of compressed air to alternate. faces or a piston therebyseparating and lifting selected amounts of viscous material from thesupply, and discharging the same.

Another object ofi this invention is to provide a simplified structureof the character to: be described which performs its attendantfunctions smoothly and economically.

Ancillary objects and features ofnovelty will become apparent. to. .those skilled in the art, in following the description of the.-I1Yention, illustratedin the accomp'emying drawings, wherein:

Figure 1 is a longitudinal sectional view of the preferred form of the invention;

Figure 2 is a plan view of the invention shown in Figure l;

Figure 3 is an elevational view of the preferred form of the invention, the valvenstructurebeing shown in section Vto illustrate the detail thereof;

Figure 4 is anl elongated sectional view of the cylinder and valve mechanism;

Figure 5 is a sectional view takensubstantially on the line 5- 5 of. 1-'i gure 3Y and inthe direction of the arrows;

Figure 6 is van venlarged, sectional view of .the piston head used `inconnection lwith the invention;

Figure is. a sectional viewtaken 0.11 @110.11116 'iof Figure 1; and

Figure 8 is a sectional vewtalen von the line 8-8 of Figure 1.

This invention has heen developed to provide a device for performingnormal pumping operations in an improved manner. It is one of the prime purposes .of thefpresent invention therefore, to provide a deviceI for performing thisfunction.

In handlingmaterials of a high viscosity such as grease, a pump must `be provided of such a construction as to withstandshock, harsh treatment and must operate under conditions of high stress. The presentginvention includes a pump construction havingthese qualities.

The specic structure characterizing the present invention includesmechanical elements which may be made of any material, preferably those materials having' high'fanti-corrosion qualities. A cylinderA Ill is providedwith detachable Vend plates I2 and I4 respectively. v These end vplates are formed with .grogves I 6 and 5 I Iih respectively 2 anims. (o1. v'iai- 154) 'may' be used, this expedient may be resorted to.

Stay bolts 26 extend from the spaced plates I4 and I2 and have conventional nuts 2,2 maintaining the cylinder construction in position."

A double acting piston generally indicated at 24 is reciprocatingly mounted within the cylinderv I0 and'may be of the construction' seen infFigure 6. A boss, 26 is internally threaded 'for reception of 'the vpiston rod 28 and also has a smooth bore portion 36 for reception of the opposed piston rod 32;' The said piston rod 32 has an' enlargement 34 slidingly received inthe smooth portion 30 thereby allowing a predetermined amount of lost motion in the piston rod 32 upon actuation of the double acting piston.

'An internally threaded member such as a nut 36 is suppliedonthe externally .threadedv portion vofthe boss 26 and a washer 38 is interposed between the nut 36l andilexible seal 40. A spacer disk 42 is supplied' on the boss 2 6, separating a second identical flexible (preferably leather) `sea144.

' It is noted that the boss 26 is formed with an enlargement at ythe end opposite the said nut 36 whereon a second washeri'lil is seated bearing against this enlargement and the second seal 44. Itis now readily app-arent that upon tightening the internally vthreaded memberor nut 36 the piston head is fabricated.

Attached to the 4plate I4 is a support 46 having a bore 50 therein. Communicated with this" bore 50 is aslot I52 whichV has a pair of vpins'l and 56 respectively extending therethrough. lThis pair o f pinsis connected byme'ans of aresilient member 58 which acts as a' bumper. The upperend of the said piston' rod L432 has a collar 66 secured thereto, said pin Q54 extending therefrom'. `A spacer sleeve .64 rests 'on the saidcollar 60 and engages the lower collar'66 thereby spacing the two collars a predetermined amount. It is noted from inspection 'of Figure 1 that the said collars 66 and `6I] and consequently the pins 54 and 56 fare `adjustably' mounted on the said piston rod'32 through the medium of a nut 68 which is threadedlyn'receivedon the said piston rod 32j 'this nut bearing von the upper collarSU. When itis dewith each set of ports.

3 sired to change the stroke of a valve construction,. to be described subsequently, in order to obtain optimum operational conditions, the nut 68 may be simply adjusted, the collars may be shimmed or other conventional expedients may be resorted to in this connection.

Valve means is supplied in association with the invention for directing compressed air to opposite sides of the double acting piston for actuation thereof. The valve means may be seen best in Figures 3, 4 and 1 wherein there is disclosed a block 'l0 having a bore therein. This block is integral with the support 48, thereby being attached to the cylinder I8 through the medium of the intermediate structure. A sleeve '|2 is secured in the said block I0 and has two sets of ports generally indicated at 14 and 16 respectively formed therein. Passages 18 and 80 are formed in the said block 10 communicating Another passage 82 extends through a portion of the support 48 and terminates in a port 84 formed in the said upper plate |4. In order to form the passage 82, the block 'I8 may be drilled and then plugged by means of a conventional closure plug 86 (see Figure 1).

The said passage 80 communicates with an outlet elbow 88 which in turn has a conduit 90 attached thereto. This conduit 90 terminates in a fitting 92, communicating with the lower portion of the cylinder I0.

An inlet conduit 94 communicates with an opening in the block 'l0 and sleeve '|2 for allowing the ingress of compressed air to the valve structure, whence it is directed selectively to the upper surface and the lower surface of the said double acting piston 24. Through this expedient, it is readily apparent that the piston is actuated in the cylinder I for separating and lifting charges of relatively viscous material from a sup- D1Y- A valve core 98 is reciprocatingly mounted in the sleeve 'I2 and has a pair of integral piston heads |00 and |02 spaced on the valve core, forming a portion thereof. It is now apparent that upon reciprocation of the core 98, the piston heads |00 and 82 respectively will control the ports 14 and 16 for permitting the compressed air entering through the conduit 94 to ow to either the top portion or the lower portion of the piston 24. By this selection in direction of compressed air ilow, the piston 24 is reciprocated. In order that the invention be smoothly and quietly operative, a collar |06 may be formed integral with or secured to the valve core 98 and a resilient bumper |08 may be seated thereon for reaction against the upper portion of the block 10 and the said washer or collar |06. The lower A' portion of the valve core is reduced to a stem ||0 having threads thereon. This stem also receives a resilient bumper |2 engaging a collar ||4, maintained in place through the medium of a conventional nut I6. Since the lower bumper ||2 is maintained in place through the medium of a nut ||6 it is readily appreciated that this collar is adjustable on the stem I0 thereby rendering a control for the stroke of the valve core. selectivity is thus produced.

Exhaust ports ||8 and |20 respectively extend not only through the block 10 but also through the sleeve 12 Within the block. When the piston is in the position shown in Figure l, it is readily apparent that the compressed air progresses through the inlet conduit 94, thence through the said ports and through the upper portion of the piston 24. In this position, the lower poi" tion of the cylinder l0 is open to the atmosphere through the medium of the conduit which allows exhaust air to travel through the elbow 88, thence through the said ports 16 and out the exhaust port |20. When this device is utilized as seen in Figure 4 (another portion of a single cycle of operation) the port ||8 is permitted to conduct exhaust therefrom, the lower ports '|6 conducting compressed air to the lower portion of the cylinder |0 and consequently the undersurface of the piston construction 24.

Means for transmitting reciprocatory movement of the piston 24 to reciprocatory movement of the valve core 98 is supplied. The preferable means may be seen best in Figures 2-4, wherein a plurality of links are mutually pivotally associated with each other for this construction. The upper portion of the valve core 98 has an aperture therethrough and a pin |24 extends through this aperture. A pair of pitman links |26 are secured to alternate sides of the valve core 98 and are pivotally associated with the pin |24. The opposite end of the pitman links |26 have a pin |28 extending therethrough for reception of a second pair of pitman links |30. The opposite end of this last-mentioned pair of links |30 have pins |32 extending therethrough. Then, a iinal pair of pitman links |34 is associated with the said pair of pitman links |30. This last mentioned pair of links |34 has a shaft |36 interconnecting the same at the ends thereof opposite the connection at the pins |32. As seen in Figure 1, the said pin |30 bears on the resilient pad or bumper 58 in its travel. The assemblage of links thus described is connected to the support 4B by means of a shaft |48 extending through a bearing formed integral with the said support 48 and through the said pair of links |34. This linkage is so proportioned in size (each link) as to have locking positions at the upper and lower ends of the travel of the piston construction 24. Thus, a hesitation is supplied at the upper and lower extent of travel of the piston 24 for use due to the nature of the viscous material which is being separated from a supply. This hesitation permits a substantially complete filling and refilling of the plenum chamber in pumping operations.

Means for resiliently biasing the linkage construction to selected positions is provided. The preferable means may be seen best in Figure 3 wherein there is disclosed a pair of springs |42 and |44 respectively which are detachably connected to the free ends of the shafts |28 and |36 respectively.

At the position wherein the piston rod 32 extends through the upper plate 4, a seal |48 is supplied and maintained in place by means of a conventional collar |50 having a central .bore formed therein. The lower end of the cylinder construction has a boss |52 received therein with packing |54 at the bottom thereof. An air vent |56 is supplied in a sleeve |62 surrounding the boss and in the said boss 52. A resilient bumper and seal |58 is received in a, recess |60 formed in the boss |52. This seal also assists in maintaining the proper closure for the cylinder construction at the point wherein the piston rod 28 extends therethrough and projects therefrom.

A sleeve |62 is internally threaded at each end, being received on the boss |52 by these threads at one end and maintaining a tube |64 in the other end thereof. A suitable gasket |66 may be supplied at the junction of the tube |64 and the sleeve |62. A packing is supplied at the junction of the sleeve |62 and the boss |52. An extension |12 of the rod 28 projects through the sleeve |62 and terminates in the tube |64. Then, a sleeve |14 may be attached to a reduced threaded portion |16 of the extension rod |12. This last mentioned sleeve |14 is supplied with ports |16 and |18 forming a portion of a check valve construction. This check valve construction also includes a sleeve |80 which is threadedly received within the said sleeve |14 and has a seat formed at one end thereof for reception of a :ball valve member |82. By this construction it is seen (Figure 1) that the ball |82 is fioatingly received within the sleeve |14. The opposite end of the said sleeve |80 has an enlargement Whereon there is seated a plurality of flexible members |84 thereby forming a piston.

Upon reciprocation of the piston 24, the piston construction at |84 is also reciprocated for receiving a viscous material therethrough.

A cap |86 is threadedly attached to the terminal portion of the tube |64 and has a plurality of slots |88 cut therein to serve the purpose 0f a strainer. Interposed between the cap |86 and the lower end of the said tube |64 is a spider |90 having a ball |92 engageable therewith. This ball floats in the zone dened by the spider |90 and an opening |94 in the center of the cap |86. Thus, a plenum chamber is defined by the bore of the tube |64 in this zone. Grease or other viscous material is pulled into the plenum chamber by reciprocation of the piston construction |84, after it has passed through the strainer and check valve construction at the foot of the tube |64. Also, the grease or other viscous material must extend through the check valve |82 before it is received in the discharge port construction.

This discharge port construction may be seen best in Figure 1 where a relatively heavy conduit member |96 is threadedly attached to the sleeve |62, with the bore thereof communicating with the bore of the sleeve. An enlargement of the bore of the conduit member |96 seats a spring |98 therein which reacts on a check valve member 260. This check valve member of course closes the bore of the member |96 until reacted upon by a predetermined pressure. In order to adjust the compression of the spring |98 a threaded plug 202 is received in the said member |96 which has the said spring |98 reacting thereon. A small pin 204 may be secured to the said plug 202 for firmly seating the spring in the enlargement of the bore of this member. A suitable outlet 206 may be formed in said member |96 and if it is found desirable, it may be tapped to receive a hose, flexible conduit, rigid conduit or the like thereon. In order to relieve the air which becomes trapped in the plenum chamber adjacent the discharge means thereof, a Valve is Supplied. This valve may be seen in Figure 1 as the valve casing 2|2 having the sleeve 2 I4 integral therewith and threadedly received in the sleeve |62. A threaded core 2|6 is received in the valve housing 2|2 and upon manipulation thereof the air which is trapped under pressure in the grease discharge structure may vbe relieved manually.

From the foregoing a clear understanding of the invention is deemed apparent. However, it is understood that certain variations may be made without departing from the spirit of the invention. Therefore, limitation is sought only in accordance with the scope of the following claims.

Having described the invention what is claimed asnew is:

1. A motor comprising a cylinder, a doubleacting piston reciprocably disposed in said cylinder, a piston rod, a lostl motion connection connecting said piston rod to said piston and extending slidably through one end of said cylinder, a support on said one end of said cylinder having a bore therethrough through which said piston rod slidingly extends and having a slot opening into said bore throughout the length of the bore, longitudinally spaced pins on said piston rod projecting through said slot for non-rotatably guiding said piston rod, the ends of said cylinder having iluid inlet ports for delivering fluid under pressure to the opposite faces of said piston, said support having a valve chamber therein having longitudinally spaced openings therein communieating with said ports, a fluid conduit opening into said chamber between said openings, a valve reciprocable in said valve chamber for selectively communicating said openings with said ports, a pair of links pivotally mounted intermediate their ends on opposite sides of said support, a shaft connecting one set of ends of said links and being disposed between said pins, pivotally connected members attaching the other set of ends of said links to said valve and over center snap acting spring means connecting said shaft and said connecting means to reciprocate said valve in respect to movement of said shaft by said piston rod pins.

2. A motor comprising a cylinder, a doubleacting piston reciprocably disposed in said cylinder, a piston rod, a lost motion connection between said piston rod and said piston to cushion the piston adjacent each end of the cylinder, said cylinder having inlet ports at each end thereof for the introduction of fluid under pressure to opposite faces of said cylinder, a valve member having a valve cham'ber therein and a pair of longitudinally spaced conduit means communicating with said ports, a fluid inlet opening into said valve chamber between said conduit means, a valve reciprocably disposed in said chamber for selectively communicating conduit means with said inlet opening, longitudinally spaced pins on said piston rod, a pivotally connected linkage having one end thereof disposed between said pins and the other end thereof connected to said valve member, and an over cent-er, snap-acting spring means connecting the ends of said linkage to reciprocate the valve in response to movement of Saud plston rod' 'rHEoDoRE F. DREYER..

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